US3581126A - Mounting device for flexion vibrators - Google Patents

Mounting device for flexion vibrators Download PDF

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Publication number
US3581126A
US3581126A US888513A US3581126DA US3581126A US 3581126 A US3581126 A US 3581126A US 888513 A US888513 A US 888513A US 3581126D A US3581126D A US 3581126DA US 3581126 A US3581126 A US 3581126A
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US
United States
Prior art keywords
flexion
strips
vibrator
vibration
strip
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US888513A
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English (en)
Inventor
Luc Omlin
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Centre Electronique Horloger SA
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Centre Electronique Horloger SA
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Filing date
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Application filed by Centre Electronique Horloger SA filed Critical Centre Electronique Horloger SA
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Publication of US3581126A publication Critical patent/US3581126A/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
    • G04F5/04—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses
    • G04F5/06—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses using piezoelectric resonators
    • G04F5/063—Constructional details
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders; Supports
    • H03H9/09—Elastic or damping supports

Definitions

  • each strip respectively is directly secured to the flexion vibrator whilst the other end is connected to the support; the long sides of the sections of the strips run practically parallel to the mainidirection of vibration, and the strips are bent practically perpendicularly to the main direction of vibration and at least partly in a direction perpendicular to the vibration node axes.
  • the invention is generally concerned with a mounting device for flexion vibrators with two vibration node axes, which have a hold on the surfaces of the flexion vibrator in the neighborhood of .nodes in the points of emergence of the vibration node axes, and comprises strips of approximately rectangular section in connecting members between flcxion vibrator and securing points on a support.
  • the invention concerns in particular a mounting device for X-Y flexion quartzes serving as regulators in time-measuring devices, primarily in portable time-measuring devices such as pocket or wristwatches.
  • Mounting devices for X-Y flexion quartzes for instance in portable time-measuring devices have to fulfill two conditions, the materialization of which leads to mainly contradictory constructive measures.
  • the first condition is that under the influence of jolts or regular accelerations the flexion quartz must not come into contact with masses which might damp its vibration.'The mounting device must therefore be sufficiently stiff to prevent the quartz from knocking against other masses.
  • the second condition is that little or no energy must be withdrawn from the flexion quartz through the mounting device, as this would lead to an irregular motion of the flexion quartz and precisely to inadmissible energy losses. According to the second condition the mounting device must therefore only cause the smallest possible forces to react on the flexion quartz in the region of its greatest motion, and must be correspondingly yielding.
  • Shock absorbers of many various kinds have already been proposed for mounting vibrating quartzes. In sizes suitable for small watches however, they require to be fashioned with great precision and in any case special space, which can only be found with difficulty in Wristwatches, for instance.
  • a mounting device for flexion quartzes is also already known, which is secured to the quartz in nodepoints and comprises strips of approximately rectangular section in connecting members between quartz and securing points on a support. In this case the strips form spiral springs and are wound round prolongations of the vibration node axes.
  • This known mounting device (French Pat. Specification 980,022) has in particular the advantage that it only allows very weak torsional forces to react on the flexion quartz whilst it is vibrating.
  • this mounting device is obviously lacking in stiffness in the direction of the vibration node axes to such an extent that the slightest impact causes the flexion quartz to collide with the nearby support. This known device is thus unsuitable as a mounting device for flexion quartzes in small portable apparatus.
  • the object of the invention is to overcome said disadvantages, and to provide a mounting device for flexion vibrators which is relatively stiff against shocks and regular accelerations whilst it does not influence the natural vibration of the flexion vibrator.
  • this mounting device must be of very simple construction and very cheap and only take up a very little space.
  • the immediate purpose which the invention pursues consists in providing a regulator for a small watch which is as small as possible and only consumes very little energy.
  • the above mentioned mounting device is constructed in such a manner that one end of each strip respectively is directly secured to the flexion vibrator whilst the other end is connected to the support, that the long sides of the sections of the strips run practically parallel to the main direction of vibration, and that the strips are bent practically perpendicularly to the main direction of vibration and at least partly in a direction perpendicular to the vibration node axes.
  • the strips can be bent respectively practically perpendicularly to the main direction of vibration to form loops directed towards the flexion vibrator.
  • the components parallel to the vibration node axes of the directions in which the strips extend should be greater in the regions of the vibration node axes than the sum of all such components remaining in the regions outside the vibration node axes.
  • the new mounting device can, in certain circumstances, already be so stiff that its connection to the flexion vibrator becomes problematic.
  • the feet can be formed by appropriately bent over ends of the strips and the contact faces can each be formed by a part of the broad face of a strip.
  • the feet are each formed by upsetting the end of a strip and the contact faces are each formed by the end face of the same strip.
  • a strip of the mounting device only offers a relatively slight resistance to torsion. Owing to the fact that the long sides of the cross section of a strip run approximately parallel to the principal direction of vibration, the resistance to flexion of the strip in the principal direction of vibration of the flexion vibrator is relatively high. In spite of this, periodic flexions of a strip of the described shape cannot be prevented in the mounting .device, and this even if only purely torsional forces were acting on the end of the strip which is secured to the flexion vibrator. This end thus effects a vibrating motion approximately along an arc of a circle. A virtual rotational axis runs through the center of the arc, around which, as seen from the flexion vibrator, the strip of the connecting member between the flexion vibrator and the securing point on the support is caused to swing periodically.
  • the strips are to be secured by one end to the flexion vibrator respectively in points removed from the vibration nodes from which rotational and translation forces are transmitted to the strips which cause periodic deformations within the elastic range in the strips the virtual rotational axes of which, in relation to the securing points, practically coincide with the vibration node axes so that the strips form part of the entire vibrating system.
  • the elasticity, length and mass distribution of each strip are appropriately such that the strip is itself resonant in the range of the resonance frequency of the flexion vibrator.
  • FIG. 1 shows a perspective view of a schematic model of a i flexion vibrator with its mounting device.
  • the main direction of vibration of the flexion vibrator 1 is to be that of a coordinate X.
  • the coordinates X, Y and Z, respectively X, Y and Z indicated in FIG. 1 correspond to the main directions of a crystal lattice well known in crystallography.
  • FIG. 1 the essential components of a mounting device arranged according to the invention are shown to be constituted by two strips 2 and 3 which are secured by means of feet 4 and 5 to one of the X-Y faces of the flexion vibrator.
  • the feet 4 and 5 are simply the bent over ends of the two strips 2 and 3, of each of which a part of the surface of a broad face is about parallel to the X-Y surface and is connected to the latter by soldering or welding.
  • Torsion segments 6 and 7 of each of the two strips 2and 3 run about parallel to the vibration node axes of the flexion vibrator 1.
  • the stresses set up in the torsion segments when the flexion vibrator 1 is vibrating are mainly torsional stresses. At the outer ends of the torsion segments the strips are bent over towards one another.
  • a piezolectrically driven flexion quartz 14 is arranged within a housing 13 and is held on the cover 15 of this housing by means of a mounting device arranged according to the invention.
  • the mounting device consists of four connecting members 16, 17, 18 and 19 altogether, of which to simplify matters only the member 19 will be described in detail.
  • the main direction of vibration of the flexion quartz is accordingly perpendicular to the plane of the figure whilst in FIG. 3 it is in the plane of the figure and perpendicular to the coordinate Y which is not particularly indicated but corresponds to the same coordinate in HO. 1.
  • the connecting member 19 consists essentially of a strip 20, of rectangular cross section, and of a pin 21 belonging to a glass-sealed lead in the cover 15.
  • Soldered joints 23 and 24 connect the strip 20 on the one hand to an electrode of the flexion quartz l4 and on the other to the pin 14.
  • the soldered joints consist essentially of silver or gold alloy.
  • the flexion quartz has a total length of 23.8 mm. in the Y direction, a width of 1.2 mm. in the Z direction and a thickness of 0.8 mm. in the X direction, and a resonance frequency of 8,192 Hz.
  • the strip 20 is made of copper-beryllium bronze and its cross section has a length of 0.2 mm. and a width of 0.l mm.
  • the total length of the connecting member 19 as well as of the other connecting members id equal to 2.6 mm. in the Y direction and the means distance between the pin 21 and the flexion quartz in the Z direction is equal to 0.7 mm.
  • a first bend 25 at the end of the torsion segment of the strip 20 has a radius of 0.4 mm. whilst the radius of the loop 26 of the strip isequal to 0.25 mm.
  • the summit of the loop is situated at a distance of 1.1 mm. in the Z direction from the nearest face of the flexion quartz.
  • the improvement afforded by the object of the application can be assembled in the case of the embodiment last described by the fact that the resulting quality factor was as high as 120,000 and that even after constant accelerations of more than 500 g. no variation of the frequency or permanent deformations could be observed. Sudden accelerations can considerably exceed l,000 g. without causing permanent damage or defective measurements. Comparative tests with flexion quartzes mounted in a similar fashion by means of connecting members of circular cross section showed that with the same quality factor at rest the resonance frequency became unsteady in the region of I00 g. and that a permanent deformation of the connecting members was to be observed.
  • the strips of rectangular cross section offer a considerable resistance to flexion in the X direction and thus prevent any excessive deviation of the flexion quartz 14 in relation to the housing 13.
  • the strips with a rectangular cross section offer, compared to wires with a circular cross section having the same cross-sectional surface, the advantage that their resistance to torsion is lower so that the reaction forces they exert on the flexion quartz are smaller.
  • the described success is probably also enhanced by the fact that the securing points of the strips l6--l9 on the flexion quartz 14 are shiftedtowards the exterior in the relation to the nodal points on the X-Y faces.
  • a mounting device for flexion vibrators having at least two vibration node axes, comprising a plurality of strips being in operative engagement with said vibrator at a vibration node thereof and connected with a corresponding support means, each of said strips having a first portion, the longitudinal axis of which is generally perpendicular to the principal direction of vibration of said vibrator, a second portion, the longitudinal axis of which is substantially parallel to the longitudinal axis of said vibrator, and a third portion disposed generally perpendicularly to the axis of said vibration node, wherein the long side of said rectangular cross section lies in a plane generally parallel to the plane of said principal direction of vibration.
  • strips further comprise open loop portions disposed between said first and second portions, the plane of said loops being generally per- 4 pendicular to said principal direction of vibration.
  • the feet are formed by appropriately bent over ends of the strips and that the contact faces are each formed by a part of the broad face of a strip.
  • Device according to claim 1 for mounting piezoelectrically driven flexion quartzes the surface of which is coated with various electrode layers, wherein beryllium bronze strips are each directly connected to one of the electrode layers and form electrically conducting leads.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US888513A 1969-01-13 1969-12-29 Mounting device for flexion vibrators Expired - Lifetime US3581126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH40269A CH499819A (de) 1969-01-13 1969-01-13 Vorrichtung zum Aufhängen von Biegeschwingern in Zeitmessgeräten

Publications (1)

Publication Number Publication Date
US3581126A true US3581126A (en) 1971-05-25

Family

ID=4186198

Family Applications (1)

Application Number Title Priority Date Filing Date
US888513A Expired - Lifetime US3581126A (en) 1969-01-13 1969-12-29 Mounting device for flexion vibrators

Country Status (8)

Country Link
US (1) US3581126A (fr)
AT (1) AT307320B (fr)
BE (1) BE744307A (fr)
CA (1) CA924113A (fr)
CH (2) CH40269A4 (fr)
FR (1) FR2033235B1 (fr)
GB (1) GB1297267A (fr)
NL (1) NL7000304A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751692A (en) * 1970-11-23 1973-08-07 Centre Electron Horloger Temperature insensitive piezoelectric resonator mounting
US3754153A (en) * 1971-12-02 1973-08-21 Bulova Watch Co Inc Crystal mounting assembly
US3794867A (en) * 1971-02-19 1974-02-26 Cie D Electronique Piezo Elect Fixing device for an oscillatory crystal
US3851193A (en) * 1973-12-10 1974-11-26 Hughes Aircraft Co Horizontal crystal mounting assembly
US3885174A (en) * 1974-01-16 1975-05-20 Motorola Inc X-T flexure piezoelectric device
US3906249A (en) * 1971-02-26 1975-09-16 Guy Gibert Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations
US4139793A (en) * 1976-09-14 1979-02-13 Ebauches S.A. Integral resonant support arms for piezoelectric microresonators
US4267479A (en) * 1977-09-16 1981-05-12 Citizen Watch Co., Ltd. Mounting clips for thickness shear piezoelectric oscillator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295622A (en) * 1965-01-13 1967-01-03 Arthur H Pitchford Steerable load-carrying vehicle
EP3812842B1 (fr) * 2019-10-24 2023-11-29 The Swatch Group Research and Development Ltd Dispositif de guidage en pivotement pour une masse pivotante et mécanisme résonateur d'horlogerie

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371613A (en) * 1942-12-31 1945-03-20 Bell Telephone Labor Inc Piezoelectric crystal apparatus
GB605288A (en) * 1944-12-23 1948-07-20 Patelhold Patentverwertung An improved fixing arrangement for piezo-electric crystals
US2830204A (en) * 1955-07-01 1958-04-08 Harris Transducer Corp Linear mechanical oscillator circuit element transducer
US2953696A (en) * 1957-04-29 1960-09-20 Bell Telephone Labor Inc Piezoelectric crystal unit
US3054915A (en) * 1959-03-16 1962-09-18 Hill Electronics Inc Mount for piezo-electric crystal
US3206986A (en) * 1963-01-04 1965-09-21 Western Electric Co Apparatus for sensing selected movements of a body

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371613A (en) * 1942-12-31 1945-03-20 Bell Telephone Labor Inc Piezoelectric crystal apparatus
GB605288A (en) * 1944-12-23 1948-07-20 Patelhold Patentverwertung An improved fixing arrangement for piezo-electric crystals
US2830204A (en) * 1955-07-01 1958-04-08 Harris Transducer Corp Linear mechanical oscillator circuit element transducer
US2953696A (en) * 1957-04-29 1960-09-20 Bell Telephone Labor Inc Piezoelectric crystal unit
US3054915A (en) * 1959-03-16 1962-09-18 Hill Electronics Inc Mount for piezo-electric crystal
US3206986A (en) * 1963-01-04 1965-09-21 Western Electric Co Apparatus for sensing selected movements of a body

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751692A (en) * 1970-11-23 1973-08-07 Centre Electron Horloger Temperature insensitive piezoelectric resonator mounting
US3794867A (en) * 1971-02-19 1974-02-26 Cie D Electronique Piezo Elect Fixing device for an oscillatory crystal
US3906249A (en) * 1971-02-26 1975-09-16 Guy Gibert Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations
US3754153A (en) * 1971-12-02 1973-08-21 Bulova Watch Co Inc Crystal mounting assembly
US3851193A (en) * 1973-12-10 1974-11-26 Hughes Aircraft Co Horizontal crystal mounting assembly
US3885174A (en) * 1974-01-16 1975-05-20 Motorola Inc X-T flexure piezoelectric device
US4139793A (en) * 1976-09-14 1979-02-13 Ebauches S.A. Integral resonant support arms for piezoelectric microresonators
US4267479A (en) * 1977-09-16 1981-05-12 Citizen Watch Co., Ltd. Mounting clips for thickness shear piezoelectric oscillator

Also Published As

Publication number Publication date
AT307320B (de) 1973-05-25
FR2033235A1 (fr) 1970-12-04
CA924113A (en) 1973-04-10
DE2001337B2 (de) 1972-10-19
CH499819A (de) 1970-06-30
CH40269A4 (fr) 1970-06-30
NL7000304A (fr) 1970-07-15
BE744307A (fr) 1970-06-15
GB1297267A (fr) 1972-11-22
FR2033235B1 (fr) 1974-03-01
DE2001337A1 (de) 1970-07-30

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